Apparatus for grinding ores and other materials.



H. W. HARDINGB. APPARATUS FOR GRINDING ORES AND OTHER MATERIALS.

APPLICATION FILED OGT. 19, 1910.

Patented Nov. 3, 1914,

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H. W. HARDINGE.

APPARATUS FOR GRINDING ORES AND OTHER MATERIALS.

. I APPLICATION FILED 0CT.19, 1910. 1, 1 1 5,531 Patented Nov. 3, 1914.

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HARRY-w. HARDINGE, or ave-ironic 1v.- Y.;. ASSIGNOR 'ro- HARDINGE CONIGAL MILL COMPANY, on NEW" 2033,11. Y.,. A CORPORATION or NEW YORK.

AFPARATUS ron-sninmne onns AND OTHER MATERIALS.

To all whom it may concern:

Be it known that I, HARRY W. HARDINGE a citizen of the United States, residing at New York, in the county and State of New York, have invented certain new and useful Improvements in Apparatus for Grinding Ores and other Materials, of which the following is a full, clear, and exact description.

In .the operation of grinding mills, such as tube' mills, ball mills, pebble mills?, and the like, for grinding or disintegratin'g'ores and other materials it is usu-' ally found that the material, particularly in the case of very hard or refractory. substances, in its final state Of S1lb-diV1lOn is not so nearly uniform in size as may be de-- sired. That is, a certain percentage of the particles may be too large for the purpose desired or the subsequent methods employed for reducing the coarser particles. The utilization of this coarser portion'of the ore or other material is frequently an important consideration, and it is accordingly the object of my present invention to provide improved means whereby such coarser particles shall be subjected in the mill a longer time to the grinding or reducing action so that the percentage of coarse material finally,

broadly in myprior Patent No. 908,861,-is-

sued January5, 1909. As illustrated in the accompanying drawings the invention is combined with a Hardinge conical mill in which a relatively short inletcone and a relatively long outlet cone are attached at their bases to an intermediate cylindrical portion, but it is to be understood that the invention is not limited to use with that particular type.

In the drawings, Figure 1 shows the apparatus in vertical longitudinal section," and Fig. 2 is a plan view of the same.

As stated above, the mill illustrated is of the conical type, and its barrel or drum consists of a conical inlet portion 10 having at Specification of Letters Patent.

Application filed 0ctober19, 1910. Serial No. 587,849.

its apex a tubular inlet trunnionrll, a conical outlet portion 12 having at its apex a tubular outlet trunnion 13, the two portions named being attached at their bases to an intermediate cylindrical portion 14. trunnions are 'revolubly mounted. in bearing rings 15, 16, which have outer surfaces of spherically convex form and which are movable in correspondingly concave pillow blocks 17, 18, the latter being in turn supportedby a suitable base 19. On the inlet end of the drum or barrel is a driving gear 20, meshing with a driving pinion 21 on a shaft 22, rotated by any suitable driving means, not'shown, through the instrumentality of a pulleyi23. The shaft 22 also is journaled at its ends-in spherical bearing rings 24, 25, mounted in concave pillow blocks 26, 27, on .the base 19. It will therefore be seen that the pillow blocks at either end may be raised without disengaging or straining the gear and pinion, such movement being permitted by the swivel action, so to speak, of the spherical bearing rings in their concave sockets or pillow blocks. The operationof mills of this type is fully described in my prior patent above referred to, and hence need not be described indetail herein. Sufiice it to say :that as the barrel revolves the pieces or lum s of material, and the grinding or crus ing balls or pebbles, assort themselves according to size; that is, with the larger pieces where the barrel is of greatest diameter, and grading in size from that point toward the outlet. As the pieces are broken up they progress toward the outlet and finally issue therefrom.

If the particles discharged, or an undue proportion of them, are too large, they must be further reduced in size; either by returning them to the mill, or by suitable treatment outside, by other instrumentalities. My present invention is, designed to obviate such necessity, by keeping the particles in the mill a longer time, so that they may be subjected to the disintegrating or reducing action long enough to bring them to the desired fineness. For this purpose one of the trunnions, in the present instance the outlet trunnion, is provided with a worm 28, adapted to mesh with and hence rotate an eccentrically journaled worm gear 29. It will therefore be seen that as the gear re- The Patented Nov. 3, 1 914.

volves it will alternately raise and lower the outlet end of the barrel, the frame 30, on

' I on which the pillow blocks 18 and 25 are frame. The result of this oscillatory movement is that while the outlet is above the level of the material in the drum, no material will be discharged, so that the small partoo'small to sink into. t I V can pass over it.- 'In oscillating the drum particles to work up. to t cc and issue prematurely therefrom. There.

ticles will be subjected longer to the action of the mill. Moreover, the lower edge .or side of the conical outlet portion bein in eflect made steeper by this elevation o the outlet trunnion the larger articles of the material near the outlet will in some cases be displaced a slight distance in a direction backward from the outlet, into a zone of larger pieces or particles where the grinding or reducing action is greater. Now when the outlet is lowered the material thereat, on the point of flowing out of the barrel, will have been subjected longer to the action of the mill and hence will be correspond ingly smaller. The result is that only the finest particles will be discharged, and before the coarser particles can reach the outlet the trunnion will rise again and prevent their discharge. In this way the greater portion of the particles discharged willbe' those fine enou h to be suspended in the charged will e of coarser grade.

If desired, an annular flange 35 may be rovided inside thebarrel a short distance rom the outlet, to serve as adam for'the purpose of impeding the movement of the material near the outletilso that only pieces about a transverse axis, particularly when theconstruction is such as to allow the outlet or discharge end to fall below the horizontal, there is'a tendencyx for the coarser also exists in the ordina construction a tendency. for the materia, both fine and coarse, to issue in excess when the discharge end is below the horizontal. The concentric annular dam 35, is provided to oppose these tendencies, and does so by impeding the travel of the coarser particles. It does not, however, interfere w1th of the slime which floats on the coarser material.

A suitable counterweight 36, attachedto a rope or cable 37 running over pulleys 38,

39 and connected to the pillow block 18, may

be provided to reduce the friction between the worm 28 and gear29.

rough the mill, whenthe' latter is used for wet grinding, and only bular outlet trunnion, means e mass of material:

,drum about its longitudinal axis, and means e discharge ori-j the free discharge.

The ap aratus herein specifically shown and descri ed is simple and effective, but it.

will be understood that the invention can be embodied in other forms without departure from its proper spirit and scope as defined by the appended claims.

I claim:

1. In a mill for the purposedescribed, the combination with a drum provided with inlet and outlet openings, and means for rotating the drum about its longitudinal axis, of continuously operating automatic means for raising the outlet above the inlet opening and also lowering 'the'formerwhile the drum is revolving.

2. In a mill for the purpose described,

the combination of a drum having an end provided with aconical outlet portion provided at its apex with an outlet opening,- means for rotating the drum about its lon-v gitudinal axis, andautomatic means for oscillating the drum about a transverse axis at a the end of the drum opposite to said outlet opening.

"3. 'In"a"m1ll for the purpose 'described;: I I

use outlet-trunnion," means fOn-r 'tating-lthe'v drum about'the axis of said trunnion,-and

siutomatic'means cooperating with the tru'nnion to raise and-lower thesame in anarcabove' the horizontal axis while'the drum is the combination of a drum having a; hollow revolving.

the drum about its longitudinal axis, and

means actuated by the rotation oi the drum for oscillating the drum about a transverse 3X18. y p 1 '5. In a mill for the purpose described, the combination of a drum havinga conical outlet portion provided at its a ex with a tuor rotating the c. In a mill for the purpose described, the

In a millfor the pn desc'ribed combination Qf means for rotating combination of a drum having a tubular outlet trunnion provided with a worm, means for rotating the drum about the axis of said trunnion, and aneccentrically journaled worm gear meshing with said worm, whereby as the drum revolves it will be oscillated about a transverse axis.

' 7. In a mill for the purpose described, the combination of a drum having a conical outlet portion provided with an outlet opening 7 at itsapex, an inner annular dam concentric with the outlet opening and mounted upon the conical portion between the ends thereof, means for rotating the drum about its longitudinal axis, and means for oscillating the drum about a transverse axis while the drum is revolving. 1

8. In a, mill for the pur ose described, the combination of a drum aving a tubular outlet trunnion, and an ecoentrically journaled gear meshing with means on said 5 trunnion whereby as the drum revolves it will be oscillated about a transverse axis.

In testimony whereof I aflix my signature in the presence of two subscribing witnesses.

HARRY W. HARDIN GE. Witnesses:

M. LAWSON DYER, S. S. DUNH M. 

